Radio Shack sells Feriite-magnetic chokes, for maybe 3$. They are the
round things you often see on your computer cables and power supplies.
They absorb stray RF. They just snap together around a wire. Get a few
and try it, its cheap and worth a try.

Sheilding can be tried but I believe need to be grounded somehow.

I dought a fix may be complete, for this issue file in small claims
now, it will be cooling season before you are heard. Filing will wake
everyone up to give it effort this month.